Search U.S. government technical reports digitized or harvested by TRAIL.

Keyword Search

Sand filling in stopes

Published Year

• 1920-1929 (1) *

Subject

• Copper mines and mining--Arizona (1)
• Mines and mineral resources--Arizona (1) *

Author

• Gardner, E. D. (1)

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

Search developed and maintained by the University of Washington Libraries
Copyright 2010